Merge pull request #183 from manashty/patch-1

An "or" was missing which was added

Docs/dev-setup.md

@@ -2,7 +2,7 @@
 
 The prerequisites for setting up the remote monitoring preconfigured solution are: 
 - Visual Studio 2013 Update 4 or Visual Studio 2015
-- Azure Powershell 1.4.x (see [How to install and configure Azure PowerShell][powershell]) _Note: a reboot is required if you're installing updating PowerShell_
+- Azure Powershell 1.4.x (see [How to install and configure Azure PowerShell][powershell]) _Note: a reboot is required if you're installing or updating PowerShell_
 
 **Note:** You should verify that the NuGet Package Manager is configured correctly in Visual Studio before you continue:
  1. Launch Visual Studio 2013.